If you want to combine different types of brushes, these are perfect. I bought them for use on 3D printers and really only needed the brass brushes. However, these two brass bushings cost me $8 and I will save the nylon and steel brushes for other uses. Love the size, plastic handles and the fact that they don't have secondary bristles pointing to the opposite side for use on my Ender 3 V2.
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